The Fern Gazette Volume 20 Part 5

Published 28th June 2017

Edited by M. Gibby & A. Leonard


Diversity and adaptations of rheophytic ferns
M. Kato pg(s) 169-179
Rheophytes grow in the zone on river beds and banks that are regularly flooded after heavy rains. In the tropics, this zone is of sufficient height (from the lowest to the highest water level) that different rheophytes can occur in the lower and upper subzones. Rheophytic species are obligate or facultative and some woody plants, rarely climbers, are paedorheophytic. I enumerate 141 rheophytes and possible rheophytes in 18 families and subfamilies of rheophytic ferns and lycophytes assigned to a variety of families, suggesting recurrent adaptations. The rheophyte morphology is adapted to the habitat and shared among the lineages, and especially the leaves or leaflets are streamlined with cuneate bases and glabrous, entire, tough blades. In leaf development the mesophyll cells and intercellular spaces, together with the epidermal cells, are smaller in size during a shortened period of ontogeny. The gametophyte of rheophytes, which is independent of the sporophyte, has a different adaptive strategy from the sporophyte: a shortened duration of generation and subtle morphological modification.

A short biography of the author pg(s)180


Two hybrids of Equisetum sylvaticum (Equisetaceae) on the island of Senja, Troms, Norway
M. Lubienski & V.M. Dörken pg(s) 181-196
Equisetum ×mildeanum (E. pratense × E. sylvaticum) and E. ×lofotense (E. arvense × E. sylvaticum) have been discovered on the island of Senja (Troms, Norway). Their appearance in the field and macromorphology are extensively compared and imaged. Additionally micromorphological features of the shoot and stomata of both rare hybrid taxa and the involved parental species have been examined by SEM technology. Distribution maps illustrate the known occurrence for the European Nordic countries. A third taxon, E. ×bowmanii (E. sylvaticum × E. telmateia), is included in the comparative study to include all known E. sylvaticum hybrids in a single SEM investigation for the first time.

New record of the rare Serpocaulon obscurinervium D. Sanín (Polypodiaceae) in the eastern cordillera of Colombia
D. Sanín, V. Torrez, J.L. Peña-Núñez & E. Trujillo-Trujillo pg(s) 197-201
Serpocaulon obscurinervium is considered as a rare and threatened species, with only four exemplars registered including the type. It was recorded from Colombia and Ecuador, but most commonly reported for central southern Colombia (central west of Chocó and south of Nariño departments). Here, we expand its distribution by reporting new records for this species on both sides of the Eastern Cordillera of the Colombian Andes, specifically from the high Andean forest of Florencia, in the Caquetá department and Suaza in the Huila department. Furthermore, this is the first record of the species as an epipetric plant. Pictures of the plant and an updated distribution map are provided.

Polystichum lonchitis (Dryopteridaceae: Pteridophyta) a montane-alpine fern species, monitored since 1978 in the Netherlands
P. Bremer & A. Smit pg(s) 203-213
Polystichum lonchitis was found in 1978 for the first time in The Netherlands on a dry ditch bank, on calcareous sand within a planted woodland (Kuinderbos). In subsequent years six other specimens were found at three other sites, in a woodland, on a scree in a chalk stone quarry and on a wall, and four of these plants became fertile. Mortality in five out of seven plants resulted from a small landslide, habitat destruction, browsing and frost damage. Long term monitoring of two plants showed the impact of rainfall and frost on vitality. No recruitment was observed in the spore shadow of adult plants.


An Annotated Checklist of Indian Pteridophytes Part – 1 (Lycopodiaceae to Thelypteridaceae. Fraser-Jenkins, C.R., Gandhi, K.N., Kholia, B.S. & Benniamin, A. 2017. pp 562. Bishen Singh Mahendra Pal Singh, Dehra Dun, India.
Reviewed by M. Gibby pg(s) 214-215
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